3D PtAu nanoframe superstructure as a high-performance carbon-free electrocatalyst
| Autor: | Sungho Park, Sungwoo Lee, Sanghyun Cho, Sungjae Yoo, Jin Yong Lee, Liqiu Zhang, Lichun Liu, Dajeong Kim, Seongkeun Ih, Hao Li |
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| Rok vydání: | 2019 |
| Předmět: |
Superstructure
Materials science chemistry.chemical_element 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Electrocatalyst 01 natural sciences Evaporation (deposition) 0104 chemical sciences Catalysis chemistry.chemical_compound chemistry Chemical engineering Nanocrystal General Materials Science Methanol 0210 nano-technology Platinum Carbon |
| Zdroj: | Nanoscale. 11:2840-2847 |
| ISSN: | 2040-3372 2040-3364 |
| DOI: | 10.1039/c8nr08231f |
| Popis: | In this work, we demonstrate how to synthesize a three-dimensional (3D) ordered PtAu nanoframe superstructure and evaluated its performance as an electrocatalyst. Compared to carbon supported platinum (Pt) nanocrystal electrocatalysts (wherein the aggregation- and carbon corrosion-induced fast degradation is a well-known drawback), the 3D PtAu nanoframe superstructure is free from aggregation and carbon corrosion. The 3D superstructure was self-assembled via drop-casting and evaporation using truncated octahedral PtAu nanoframes (TOh PtAu NFs) as building blocks that were produced by controlled wet-chemical etching of a TOh Au core whose edges and vertexes were selectively deposited with Pt atoms. Density functional theory calculations revealed that the surface alloy state of PtAu gave rise to an enhanced catalytic activity compared to pure Pt. Experimental investigations showed that such 3D superstructure electrocatalysts exhibited excellent mass transfer efficiency, higher catalytic activity and stability towards the methanol oxidation reaction (MOR) compared to a commercial Pt/C catalyst. The demonstrated 3D nanoframe superstructure shows great potential for practical catalytic application due to its high structural stability, high catalytic activity, high surface area and ease of fabrication. |
| Databáze: | OpenAIRE |
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